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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd395e94f0da4e290f5b47e037758effafc5e69cad5f8e486caf159a2b2307719' 
  AND token = 'u4UsLZMu8Ya0QMM6pmjktvYy7BDsF5hp3pytnUNtd/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}